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Stockholders' Equity (Tables) | 12 Months Ended
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Sep. 30, 2014
Equity [Abstract] |
Fair Value Calculations for Stock-Based Compensation Awards | The fair value calculations for stock-based compensation awards to employees for the fiscal years ended September 30, 2013 and 2012 were based on the following assumptions:
|  | 2013 |  | 2012
Risk-free interest rate |  | 0.18% - 1.20% |  | 0.35% - 1.06%
Expected life (years) |  | 5.3 |  | 5.0
Expected volatility |  | 175% |  | 110%
Expected dividends |  | None |  | None
Stock-Based Compensation Expense Related to Stock Options and RSUs | The following table summarizes stock-based compensation expense related to stock options and RSUs under ASC 718 for the fiscal years ended September 30, 2014, 2013 and 2012, which were allocated as follows:
|  | 2014 |  |  | 2013 |  |  | 2012 |
Sales and marketing |  | $ | 823,876 |  |  | $ | 433,130 |  |  | $ | 471,716 |
Research and development |  |  | 675,033 |  |  |  | 617,377 |  |  |  | 592,249 |
General and administrative |  |  | 1,945,571 |  |  |  | 1,741,355 |  |  |  | 1,535,893 |
Stock-based compensation expense related to employee stock options included in operating expenses |  | $ | 3,444,480 |  |  | $ | 2,791,862 |  |  | $ | 2,599,858 |
Summary of Vested and Unvested Options, Weighted Average Exercise Price per Share, Weighted Average Remaining Term and Aggregate Intrinsic Value | The following table summarizes vested and unvested options, weighted average exercise price per share, weighted average remaining term and aggregate intrinsic value at September 30, 2014:
|  | Number of Shares |  |  | Weighted Average Exercise Price Per Share |  |  | Weighted Average Remaining Contractual Life (in Years) |  |  | Aggregate Intrinsic Value |
Vested |  |  | 1,878,695 |  |  | $ | 3.94 |  |  |  | 5.00 |  |  | $ | 1,090,096 |
Unvested |  |  | 455,631 |  |  | $ | 4.80 |  |  |  | 7.33 |  |  |  | 8,084 |
Total |  |  | 2,334,326 |  |  | $ | 4.11 |  |  |  | 5.46 |  |  | $ | 1,098,180 |
Stock Option Activity | The following table summarizes stock option activity under the Company’s stock option plans during the fiscal years ended September 30, 2014, 2013 and 2012:
|  | Number of Shares |  |  | Weighted Average Exercise Price Per Share |  |  | Weighted Average Remaining Contractual Term (in Years) |
Outstanding, September 30, 2011 |  |  | 4,553,904 |  |  | $ | 1.34 |  |  |  | 6.15 |
Granted |  |  | 1,095,750 |  |  | $ | 8.54 |  |  |  |  |
Exercised |  |  | (1,812,215 | ) |  | $ | 0.81 |  |  |  |  |
Cancelled |  |  | (325,153 | ) |  | $ | 6.41 |  |  |  |  |
Outstanding, September 30, 2012 |  |  | 3,512,286 |  |  | $ | 3.39 |  |  |  | 6.46 |
Granted |  |  | 651,563 |  |  | $ | 3.63 |  |  |  |  |
Exercised |  |  | (1,103,582 | ) |  | $ | 0.90 |  |  |  |  |
Cancelled |  |  | (235,303 | ) |  | $ | 7.26 |  |  |  |  |
Outstanding, September 30, 2013 |  |  | 2,824,964 |  |  | $ | 4.09 |  |  |  | 7.29 |
Granted |  |  | — |  |  | $ | — |  |  |  |  |
Exercised |  |  | (108,135 | ) |  | $ | 1.27 |  |  |  |  |
Cancelled |  |  | (382,503 | ) |  | $ | 4.77 |  |  |  |  |
Outstanding, September 30, 2014 |  |  | 2,334,326 |  |  | $ | 4.11 |  |  |  | 5.46 |
Significant Ranges of Outstanding and Exercisable Options | The following table summarizes significant ranges of outstanding and exercisable options as of September 30, 2014:
Range of Exercise Prices |  | Number of Options Outstanding |  |  | Weighted Average Remaining Contractual Life (in Years) |  |  | Weighted Average Exercise Price |  |  | Number of Exercisable Options |  |  | Weighted Average Exercise Price of Exercisable Options |  |  | Number of Unvested Options |
$0.09 to $0.79 |  |  | 336,762 |  |  |  | 5.24 |  |  | $ | 0.73 |  |  |  | 336,762 |  |  | $ | 0.73 |  |  |  | — |
$0.80 to $1.10 |  |  | 350,000 |  |  |  | 1.39 |  |  | $ | 0.93 |  |  |  | 350,000 |  |  | $ | 0.93 |  |  |  | — |
$2.34 to $2.60 |  |  | 726,421 |  |  |  | 6.60 |  |  | $ | 2.52 |  |  |  | 491,671 |  |  | $ | 2.54 |  |  |  | 234,750 |
$3.33 to $9.97 |  |  | 635,000 |  |  |  | 5.74 |  |  | $ | 6.33 |  |  |  | 501,023 |  |  | $ | 6.74 |  |  |  | 133,977 |
$11.05 to $11.68 |  |  | 286,143 |  |  |  | 7.15 |  |  | $ | 11.08 |  |  |  | 199,239 |  |  | $ | 11.08 |  |  |  | 86,904 |
|  |  | 2,334,326 |  |  |  | 5.46 |  |  | $ | 4.11 |  |  |  | 1,878,695 |  |  | $ | 3.94 |  |  |  | 455,631 |
Number of Stock Options Outstanding under Prior Plans | The following table summarizes the number of stock options outstanding under the Prior Plans as of September 30, 2014:
2000 Stock Option Plan |  |  | 206,262 |
2002 Stock Option Plan |  |  | 191,000 |
2006 Stock Option Plan |  |  | 43,000 |
2010 Stock Option Plan |  |  | 1,050,321 |
Total stock options outstanding under the Prior Plans |  |  | 1,490,583 |
RSU Activity | The following table summarizes RSU activity in the fiscal years ended September 30, 2014, 2013 and 2012:
|  | Number of shares |  |  | Weighted-average fair value per share |
Outstanding at September 30, 2011 |  |  | 300,000 |  |  | $ | 5.12 |
Granted |  |  | 255,835 |  |  | $ | 8.44 |
Settled |  |  | — |  |  |  | — |
Cancelled |  |  | (40,001 | ) |  |  | 11.05 |
Outstanding at September 30, 2012 |  |  | 515,834 |  |  | $ | 6.30 |
Granted |  |  | 255,000 |  |  | $ | 3.15 |
Settled |  |  | (50,829 | ) |  |  | 7.76 |
Cancelled |  |  | (27,501 | ) |  | $ | 11.05 |
Outstanding at September 30, 2013 |  |  | 692,504 |  |  | $ | 4.85 |
Granted |  |  | 625,139 |  |  | $ | 4.83 |
Settled |  |  | (63,334 | ) |  | $ | 4.66 |
Cancelled |  |  | (153,006 | ) |  | $ | 5.03 |
Outstanding at September 30, 2014 |  |  | 1,101,303 |  |  | $ | 4.71 |

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